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BOWTIE

BOWTIE . A Visual Aid for Risk Studies Session Name: HPI Industry Forum Session ID: INHP 3 Patrick Fisher, EIT 11/09/11 . The point of a risk study. Identify. Quantify. Mitigate. NOT SAFE. DuPont identified the risk. DuPont quantified the risk. But failed to mitigate the risk.

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BOWTIE

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  1. BOWTIE A Visual Aid for Risk Studies Session Name: HPI Industry Forum Session ID: INHP 3 Patrick Fisher, EIT 11/09/11

  2. The point of a risk study Identify Quantify Mitigate

  3. NOT SAFE

  4. DuPont identified the risk

  5. DuPont quantified the risk

  6. But failed to mitigate the risk

  7. WHY?

  8. The Risk Study Failed

  9. The people who know hazards best are: The people who design and run risk studies are:

  10. Engineers like:

  11. Operators like:

  12. Risk studies look like:

  13. Mitigation Layers Protection Layers Threats Barriers Recovery measures Initiating Event (Cause) CONSEQUENCES HAZARDS Initiating Event (Cause) Hazardous Event Initiating Event (Cause) Initiating Event (Cause) Initiating Event (Cause) Initiating Event (Cause)

  14. Threats Protection Layers Mitigation Layers Barriers Recovery measures Initiating Event (Cause) CONSEQUENCES HAZARDS Initiating Event (Cause) Hazardous Event Initiating Event (Cause) Initiating Event (Cause) Initiating Event (Cause) • Reduced maintenance and testing. • Lower engineering & operating cost. • Improved recovery times, easier to understand. • Improved spurious trips, recovery time • Reduced training, engineering, procedures, maintenance. • High complexity leads to human error, spurious trips • Increased maintenance cost, spare parts • Increased replacement cost • High operating and engineering cost • Increased need for bypasses, training, procedures. Initiating Event (Cause)

  15. Alarms, trips and interlocks reduced by 30%

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